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How do I link my mex file to mkl?

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Jed on 18 Nov 2015
Commented: Steven Lord on 22 Feb 2021
I am trying to create a mex file that uses MKL. I know that Matlab itself uses the MKL library for some of its computational routines (e.g., ffts), but perhaps it is a different version and there are some conflicts? In any case, I have written a C program that is structured like this:
<a bunch of code including a function called mkl_test>
int main()
I can compile it and run it just fine. I then modify it into a mex function as follows:
#include <mex.h>
<a bunch of code including a function called mkl_test>
void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[] )
I can successully run the mex compilation, but when I attemp to run it, I get the following:
MKL FATAL ERROR: Cannot load neither nor
... then Matlab crashes.
Any help would be greatly appreciated!

Answers (1)

Heiko Weichelt
Heiko Weichelt on 18 Feb 2021
MATLAB uses Intel's MKL as BLAS and LAPACK implementation, not for FFT, however.
To see how to use those symbols inside a MEX fucntion, follow the instructions on
Notice, that the bundled MKL library shipped with MATLAB only contains BLAS and LAPACK symbols and additional MKL symbols that those symbols depend on. MATLAB's MKL library does not contain all MKL symbols.
Steven Lord
Steven Lord on 22 Feb 2021
As far as I remember we've been using the FFTW library for computing FFTs in MATLAB since about 2001. See this Cleve's Corner article.

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